Crystal Clear Water
If you're interested in exploring Fallout 4's bodies of water and you want to make it a whole lot easier on yourself, take a look at this mod.
Crystal Clear Water makes all of the bodies of water in the game extremely clear. In turn, this enables you to see items that are buried in their depths.
There are valuable items buried underwater and there are also some secrets and easter eggs worth discovering.
This mod takes the fun out of underwater exploration but if you're short on time it'll come in handy.